Duracell Coppertop C Batteries, 4 Count, 10-Year Shelf Life, Long-lasting

Customers find these batteries to be of great quality, working well and lasting a very long time, with one customer noting a 10-year shelf life. They appreciate the brand's reliability and versatility, with one mentioning they're suitable for both everyday and emergency use. Customers consider them excellent value, with one noting they're the most economical long-life alkaline batteries available. While some customers say they'd definitely buy again, others express dissatisfaction with the product.